For a fixed snatch block... This only changes the direction of pull and puts double the weight on the snatch block. For a 2000 lb item the line from the item to the block sees 2000 lbs and the line from the block to the winch sees 2000 lbs. Hence the snatch block sees 4000 lbs.
For a moving block.... Here the line from the snatch block to the fixed point sees 1000 lbs and the line from the block to the winch sees 1000 lbs. Hence the snatch block sees 2000 lbs.
As the angle of the line changes the equation to figure the line pull also changes.
A easy way to figure it is the count the lines hooked to the item you are trying to move. And a single pully snatch block always sees twice the line pull since it has two lines to it.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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